Vented acceleration discharge check valve



. Aug. 12, 1969 R. H. HIEGER 3,450,313

VENTED ACCELERATION DISCHARGE CHECK VALVE Filed Jan. 19, 1967 vz/v rm Poe m r Hz/vey #15451:

Pom r H [11/027 United States Patent 3,460,813 VENTED ACCELERATION DISCHARGE CHECK VALVE Robert Henry Hieger, 14305 Faust Ave., Detroit, Mich. 48223 Filed Jan. 19, 1967, Ser. No. 610,361 Int. Cl. F02m 37/ 1 2 US. Cl. 261-34 Claims ABSTRACT OF THE DISCLOSURE An atmospheric vent in the acceleration pump discharge passage of the carburetor for an internal combustion engine which functions when the acceleration pump chamber is exhausted so as to (1) reduce the pollution and contaminants in the air, while (2) aiding in the reduction of fuel consumption by the provision of a more efficient metering system.

Background of the invention United States Patent No. 2,768,818, dated Oct. 30, 1956, is illustrative of the prior art and shows a spring loaded check ball 107 in passage 78 and another spring loaded check ball 101 in passage 99 for the purpose of overbalancing the vacuum created by the ingress of air through the venturis 10 and 82 and the discharge nozzles 80 and 96. This of course results in an additional pressure having to be applied to the system to overcome the springs as well as a lag in the functioning of the system. The atmospheric vent provided by the applicant eliminates this problem as Well as the necessity of the springs.

Summary of the invention The automotive industry has progressed substantially in the past quarter century in many directions, with particular emphasis having been placed on engineering and safety. Although the advances have been many and rapid in rate, certain fields of study have not been quite as active as others. One of the less active fields which is now receiving much attention is that of air pollution resulting from exhaust gas emissions and poor carburetion. When, for any reason, whatsoever, the air fuel relationship is not in proper proportions, unburned hydrocarbons result and contaminate the atmosphere. In the internal combustion engine, a carburetor is used for maintaining the proper air-fuel mixture. However, under certain conditions the air fuel mixture is enriched without benefit of the carburetor metering system.

In the modern carburetor, a piston or diaphragm type acceleration pump is used. Fuel is drawn from the carburetor float bowl to fill the piston or diaphragm chamber and is discharged through the acceleration pump discharge nozzle. A check valve is positioned in the line or passage leading from the float bowl, with a second check valve being positioned in the line or passage leading from the piston or diaphragm chamber for the purpose of assuring a complete fill of the chamber when the piston or diaphragm is released. However, during high speed driving, the ingress of air through the venturi and adjacent areas creates a vacuum on the acceleration pump discharge nozzle, thus lifting the acceleration discharge check ball valve off its seat. When this occurs, fuel is drawn from the acceleration pump chamber, thereby enriching the mixture without benefit of the carburetor metering system. Thereafter, when the acceleration pump is actuated, it merely provides a partial shot of fuel into the system which results in improper engine performance. A vent as proposed in the present invention positioned intermediate the acceleration pump discharge check valve and the discharge nozzle will eliminate this long 3,460,813 Patented Aug. 12, 1969 standing problem and reduce the problems above discussed.

From the foregoing discussion, it is apparent that the applicant has solved a problem of long standing in a simple and facile manner. The use of an atmospheric vent intermediate the acceleration check valve and nozzle prevents unmetered fuel from entering the carburetion system and thus prevents indiscriminate enrichment of the air-fuel mixture.

The drawings FIGURE 1 of the drawings represents a cross section of a carburetor which embodies the present invention.

FIGURE 2 is a modified acceleration pump discharge check valve.

FIGURE 3 is another modified acceleration pump discharge check valve.

FIGURE 4 is still another modified acceleration pump discharge check valve.

FIGURE 5 is another modified discharge check valve.

FIGURE 6 is another modified discharge check valve.

FIGURE 7 is still another modified form of an acceleration pump discharge check valve.

FIGURE 8 is a diagrammatic view of the atmospheric vent opening being ported into the air cleaner, with portions thereof being broken away.

FIGURE 9 is a diagrammatic view of the atmospheric vent opening being ported into the float bowl air chamber.

Description of the embodiments FIGURE 1 of the drawings is generally schematic in form to best illustrate the present invention. The carburetor 10 is shown in cross section and has illustrated a venturi 12, a float bowl 14 and an acceleration pump (diaphragm type) 16. A passage 22 connects the float bowl 14 with the acceleration pump chamber 26, with a check ball 24 seated therebetween. A second passage 32 connects the acceleration pump chamber 26 with the acceleration pump discharge nozzle 38, with a check ball assembly 36 located therebetween.

In this particular construction which is illustrated, a standard ball check 36a is used and forms a part of the complete check valve assembly 36. The complete assembly consists of a body portion 42 of cylindrical configuration which has a passage of differing dimensions extending substantially throughout the full length thereof. An enlarged flange 44 is integral with the body portion 42 and is adapted to hold down the nozzle cluster assembly 40.

The central passage 46 in the body portion 42 has a valve seat 48 in the upper portion thereof which defines the vent in the flange portion. The valve seat 48 is adapted to seat a check ball 52 located atop a second cylindrical member 54 positioned therein. The second cylindrical member 54 is of reduced dimension at the lower end 56 thereof and is retained in the passage through the body portion by means of an integral flange rolled thereon after the respective parts have been assembled. A cross hole 58 communicates the central passage in the body 42 with the nozzle 38 in the nozzle cluster 40.

Thus, it is readily apparent that when fuel is discharged from the acceleration pump as the stem member 66 is moved to the left, check valve 24 will remain seated and check ball 36a will be moved off its seat. The velocity of the ingress fuel and the action of the check ball 36a against the lower stem portion 56 of the cylindrical member 54 will cause the body 54 to be moved upward thereby seating the ball check 52 on the upper end thereof against the seat 48 to close the vent and thus port the fuel through the acceleration pump to discharge nozzle 38 and into the air stream of the venturi. Upon the spring return stroke of the diaphragm 16 to the right, fuel is drawn from the float bowl 14, through passage 22 and around check ball 24 to fill the acceleration pump chamber 26. Depression of the stem 66 to the left exhausts the chamber in the manner above described.

FIGURE 2 of the drawings illustrates a modified form of the invention, wherein an O-ring 72 is substituted for the ball check 52 shown in FIGURE 1. The remaining structure is identical to that which is described above. The O- ring is positioned by any suitable means such as an integral flange which extends from the second cylindrical portion 54a, or perhaps a rivet pressed into an opening in the cylindrical member, with the upper surface thereof acting as a centering means.

FIGURE 4 shows another modified form of the invention wherein the valve seat 78 is of conical configuration and the end of the cylindrical member 5412 is of hollow conical configuration and made of resilient material. At tachment is by any suitable means such as an undercut flange on the end of the cylindrical member 54b.

FIGURES 3 and 5 represent additional modified forms of the invention, wherein the check ball valve 36a is eliminated and unitary construction is substituted therefore. Thus in FIGURE 3, a substantially fiat resiilent disc 88 is secured to the upper end of the cylindrical member 540, while another substantially fiat resilient disc 98 is secured to the opposite end, While in FIGURE 5, conical ends are formed on the cylindrical member 54d. The operation of each of the above modified valves is the same as the operation of the valve shown in FIGURE 1. The disc shown in FIGURE 5 as the valve seat is optional, since it is readily apparent that the conical upper portion of the cylindrical member 54d can be seated in the body portion 42d.

FIGURES 6 and 7 are further simplified forms of the present invention wherein a minimum number of parts are employed. For instance, in FIGURE 6, a vented screw 122 is positioned in a carburetor housing 110 having a nozzle 138 therein. A disc valve 136 is substituted for the ball check 36a, thereby forming a valve structure wherein the disc serves a dual function, that of providing a check on one side and a vent seal on the other. A similar structure is found in FIGURE 7, wherein the ball 36a provides the same function as the disc 136 and the nozzle is provided by an opening within a keyed cylindrical member 238.

From the foregoing description, it will be recognized that the invention is simple and can be manufactured in many ways without departing from the spirit of the invention. The applicant has provided an atmospheric vent, which will prevent enrichment of the air-fuel mixture of an internal combustion engine as a result of suction created by action of the ingress of air through the venturi in the manner above described.

Having thus described my invention, I claim:

1. In a fuel system having an accelerating pump, the combination of,

an acceleration pump discharge check valve assembly anterior of the throttle consisting of, a first cylindrical body member threaded into a carburetor housa second cylindrical member positioned within said first cylindrical body member;

a vent opening in said first cylindrical body member intermediate a porting orifice therein and said second cylindrical member; whereby displacement of said second cylindrical member through the discharge of fuel closes said vent and ports the fuel into the air stream of the carburetor venturi.

2. A device as in claim 1, wherein said second cylindrical member has a check ball intermediate the end thereof and the vent.

3. A device as in claim 1, wherein said second cylindrical member has an O-ring on the end thereof to seal the vent.

4. A device as in claim 1, wherein a flat disc is secured to said second cylindrical member for sealing the vent.

5. A device as in claim 1, wherein a conical portion is located on the end of said second cylindrical member for sealing the vent.

6. A device as in claim 1, wherein a resilient disc is provided on each end of said second cylindrical member, one disc for sealing the vent, the other for sealing the fuel entrance.

7. A device as in claim 1, wherein a conical end is provided for sealing the vent on one end and another conical end is provided to seal the fuel entrance.

8. A device as in claim 1, wherein a check ball is interposed intermediate the lower end of said second cylindrical member and the fuel inlet.

9. A device as in claim 1, wherein said vent is ported into the air chamber in the float bowl.

10. A device as in claim 1, wherein said vent is ported into the air cleaner of the engine.

References Cited UNITED STATES PATENTS 1,913,622 6/1933 Williams l37119 X 2,406,114 8/1946 Sloane et al. 2,714,897 8/1955 Whitlock l37119 2,768,818 10/1956 Egerer. 2,879,048 3/ 1959 Smitley. 3,086,757 4/1963 Smith. 3,301,540 1/1967 Walker 26169 3,347,536 10/1967 Sutton.

TIM R. MILES, Primary Examiner 

